Switch with pressure fluid arc extinguishing



Pofenfed Mar. 11, 1952 SvvIToH vvITH PBBSSUBE FLUID ABo oxTINGUISHING ondro Lafour, G enoble, I fnoe AppHoon November 27, 1946, Sefi1No. 712,478 In Efonoe 1)eoefnbef 3, 195

This invention relates to electric oirouit-breakefS of the nuid blast types, Wherein an afc forn1ed upon Sepafation of the Svvitoh oontaots is ex tinguished by a blast of uid direoted aorosS the afo gap.

(ircuitbreakefs of that kind are known, in Whioh one of the aroing oontacts iS fofnled by a nozZle, vvhich aocording to a fufthef ifnp1'ove 111ent of the pfiof aft, is Inovable, the pfeSSufe uid aotiIlg on said nozzle aS on a piston, thus profnoting of accelerating the Sepafation of the ooopefating afoing oontacts,

fn objeot of the pfeSent invention iS to diff1i1iSh the ineffia of suoh a devfoe, and to pfovide a n1ovable oontoct nleInber of vefy 1ight conStfuo tion having a centfa,1 apertufe, said oontact Inefn ber resting or being pfesSed in olosed position of the cifouit-bfeakefl on the coopefating oontaot, and being separoted ffon1 said contact and pfessed against a coopefating xed paft, preferabl fofffling a nozzle, by the pfessufe uid, thuS fofIning, in open position, With said fIxed paft prefefably Eb nozzlelike eleotrode.

Another objeot of this invention iS to pfovioe 3, n1ovable oontaotn1efnber as desofibed hefe above, and conStituted by an aSSeInbly of sevefa1 parts in vieW to di1ninish the ineftia of fhe mov able pafts.

A fufthef object of thiS invention is to pfovide a. n1ovable contaot fnen1bef aS deSofibed hefeabove, the n1oven1ent of whioh is pfonfoted by 3, piSton aotuated by aM pressure nuid and pfovided With fneans odapted to inoreaSe the shook1ike aotion of the piston on t1e n1ovable contact member Another object of this invention iS to pfovide o piston, actuated by the pfeSSure 1 111id, ooaxial vvith the Stationary oontoot mefnber, and adopted so as to difect the pfessufe fluid to the afc gap, prefefably giving to said nuid a centfipeta1 blaSt difeotion.

A fufther objeof of this invention is to pfovide 3, piSton, aotuated by the pfessufe ffuid, ooaxial With the stotionary oontact IneInber and Shaped so aS to exert a cononin action on the arc gap as desC1ibed in fny oopending apphoations ffos. 723,72 and 723,727, both oled January 23, 1947,

the piSton s Which iSSued as Patents 2,49,661 on January 17,

1950, and 2,573,797, on November 6, 1951, fe speotivelyother objectS of nly invention vi1 be appafent f1,oIn the fo11owing desoription of an elT1bodin1ent of the invention With reference to the aocom panying dfavvingS,

n the drawingS= igufe 1 is a Seotional view faken on the axis of the device;

E,igu e 2 is a ffagnlentary plan view of n1ov v fe1,ent en1bodiInenf of the Inovable contaot n1eo1- befS;

,igufe is a ffogmentafy veftical section of a Inodificotion of the pfeSSufe fluid actuated n1eanS Figure 5 iS ffagInentary veftioal seotion of a Inodioation of the contaot IneInbers.

As iHuStfated in Pigs. 1 and 2 the oifouit bfeaker is in its closed position, the path of the ouffent being indioated by the bfoken line at the left of i 1, deSignateS the stationaf contaot nlen1bef, 2 the n1ovable contact n1en1beT, 3 the ouffent input teffninal, 4 a spfing olip pfovid ing the Stationary contact of a series disoonnecting SWitch, 5 a Inovable oy1iIlder pfoviding the .fnovable contact of Said diSconneoting switch.

The Whole fneohaniSIn iS oontoined in a oaSing 22, to vvhioh the extinguiShing fneanS is Supplied.

The cifouit bfeakef is operated by a pfeSsufe fluid, suoh ais ooInpfesSed aif WhoSe path of flow iS indioated by the affowS F, E1 and 2, the af rowS l '2 indicating the path of the pressuTe uid Stfeaff1 extinguiShing the afc.

The pfeSSufe flI1id whioh follovvS the path 1 actuates the piSton s to whioh it onpaftS an aScending n1oven1ent. Seoufed to the top portiof1 of piston G is 2, nlefnbef T, preferobly made of Some inSulating Inateria1 01' insulated ffom the piSton, Whioh Sel'ves to lift the fnovable contaot 2.

The n1ovable oontaof 2 is prefefably forIned by Several subStantially ff9,t Seotor-Shaped ffleInbefs foffning fogethef a oentfal paSSage and enabled to fook obout pivotS, fof inStance about a ffletal fifn against Whioh the f1at oontaot nleInberS afe I)1'essed by spfingS 0 Suffounding xed bo1tS 10. Said SpfingS are effeotive to feliably keep the lnen1bers in oifcuit olosing poSition The operation of the device vvill be ea sily undefstood. The coTnbined ciTouit-bfeaker and diS conneoting switoh iS ShoWn in ffgure 1 in its offollit-oloSing poSitfonn ofdef to break the cifcuit, 3, preSSufe ffuid is fofced along the path indioated by the affowS P. AS the f1uid nOW afrives at the botton1 of piSton 0 it iS divided into two flowS that foHow the paths indicated by the affows F1 and P2, respeotively, The one which takeS the Way '1, enters the spaoe below ond causeS the safne to S1ide 11p WafdS in the cy1inder f l.

The n1eInber 1 urges the n1ovable fneInbefS 2 upvvafds and oauSes theIn to rook about the pivots deterInined by the meta1 fim 8 unti1 the members 2 oonle into engagement With a stop l2, pfefef ably in the fofm of a nozzle, Which 1iIT1its the displaoefnent of the Inovable oontactS 2.

At Suoh tiIne an. aTo is St1'uok between the fixed contact l and the n1ovable oontaot n1eInbefS 2. The air stfean1 f,2 fo11owS itS path in its ohanne and fS abfupy defieoted by the bend between the poftion 13 of the fixed confaot l, and the now ]ifted n1eInber thus ofeatin a violent alir membef; n1eans fof fesiliently presSing in oiro11it c1osing position Said movab1e contaot membef With one of itS fiat faoeS aga1St soid stationafy contaot nlen1ber a stotionafy part afronged vvith fespeot to said subStantiany at movable oontaot member so as to fofln a Stop liIniting the open ing movement of Said movable contact member; said stationary paft and said movable oontact IneInbef being shaped so as to pfovide a passoge Way for the eScape of the prodoots of aroing; a be11-Shaped piston suTroonding Said stationary contaot nleInber and abotting againSt said n1ov able oontact member, said movable contaot membef being shoped So aS to provide a paSSagewoy coaxia1 vvith said piston; Ineans fo1, Inoving said piston by f111id pressure so aS to cause separa tion of said movable oontact membef ffom Said Stationary oontaot Inembef and to press said n1ov able oontot member against said stationary part;

BEFEBENoES oITED The fonowing refefenoes are of reoofd in the nle of this patent= UNITED STATS PATBNTS 

